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双拉试样裂纹扩展过程中的应力强度因子计算
引用本文:何文涛,程哲,张正艺,解德.双拉试样裂纹扩展过程中的应力强度因子计算[J].固体力学学报,2011(Z1).
作者姓名:何文涛  程哲  张正艺  解德
作者单位:华中科技大学船舶与海洋工程学院;
摘    要:论文将使用一种界面单元来解决二维裂纹的静态扩展问题.这种界面单元基于虚拟裂纹闭合法,利用商业有限元软件ABAQUS的用户自定义单元UEL功能,发展为界面断裂单元,计算应变能释放率(GⅠ和GⅡ).在裂纹尖端的两个节点间设置一个特殊刚度的弹簧,并引入哑节点计算裂纹尖端后面的张开位移和裂纹尖端前面的虚拟裂纹扩展量.采用这种单元计算应变能释放率时不需要使用奇异单元或折叠单元,不会出现收敛问题,也不需要复杂的后续处理.因此,采用这种断裂单元分析二维裂纹扩展问题是方便的、高效率的,而且也能得到可靠的精度.

关 键 词:虚拟裂纹闭合法  线状裂纹  哑节点断裂单元  

COMPUTATION OF STRESS INTENSITY FACTORS FOR CRACK GROWTH IN DOUBLE TENSION SPECIMENS
Wentao He Zhe Cheng Zhengyi Zhang De Xie.COMPUTATION OF STRESS INTENSITY FACTORS FOR CRACK GROWTH IN DOUBLE TENSION SPECIMENS[J].Acta Mechnica Solida Sinica,2011(Z1).
Authors:Wentao He Zhe Cheng Zhengyi Zhang De Xie
Institution:Wentao He Zhe Cheng Zhengyi Zhang De Xie(School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan,430074)
Abstract:This paper introduces an element to deal with 2D progressive crack growth problems.An interface element was developed to calculate the strain energy release rates based on the virtual crack closure technique(VCCT) using commercial FEA software ABAQUS with the user defined element(UEL).A very stiff spring is placed between the node pair at the crack tip to calculate the internal forces and dummy nodes are introduced to extract information for displacement openings behind the crack tip and the virtual crack j...
Keywords:the virtual crack closure technique  crack  dummy node  interface element  
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